05-03-2026 10:07
Hulda Caroline HolteHello, I found and collected this species growing
07-03-2026 13:06
éric ROMERO
Bonjour tous, Sur cône d'épicea fortement imbu,
08-03-2026 14:05
Thierry Blondelle
Bonjour à tous,Sur 3 récoltes supposées de H. l
05-03-2026 16:30
François BartholomeeusenDear forum members, On the 2nd of February 2026,
06-03-2026 09:41
Alain GARDIENNET
Hi forum, I'm now looking for another reference c
Pyreno on Fraxinus excelsior.
Per Marstad,
16-03-2019 18:39
I found this to-day, in Norway.On the bark of Fraxinus, small, ca 1 mm.
Konidia 25 - 28 x 12 my.
It is nice with a name.
Per.
Chris Yeates,
16-03-2019 18:50
Re : Pyreno on Fraxinus excelsior.
Viktorie Halasu,
16-03-2019 21:20
Re : Pyreno on Fraxinus excelsior.
Dear Chris,
I'd like to ask, what's the difference between Macrophoma fraxini and Diplodia fraxini (or rather D. mutila, without brown conidia)?
Thank you in advance.
Viktorie
https://www.researchgate.net/publication/260591572_The_complex_of_Diplodia_species_associated_with_Fraxinus_and_some_other_woody_hosts_in_Italy_and_Portugal
I'd like to ask, what's the difference between Macrophoma fraxini and Diplodia fraxini (or rather D. mutila, without brown conidia)?
Thank you in advance.
Viktorie
https://www.researchgate.net/publication/260591572_The_complex_of_Diplodia_species_associated_with_Fraxinus_and_some_other_woody_hosts_in_Italy_and_Portugal
Chris Yeates,
16-03-2019 21:29
Re : Pyreno on Fraxinus excelsior.
They may represent the same thing as far as I know. "Coelomycetes" can be a taxonomic minefield, crying out for more molecular work.
Viktorie Halasu,
16-03-2019 21:39
Re : Pyreno on Fraxinus excelsior.
Yes, there's also a paper "Relationship of Macrophoma and Diplodia" (1904) by J.T.Emerson who obtained both types of conidia from a single pycnidium. That's why I was asking, to see if there's a molecular work on them.
By the way, my collections identified as Diplodia (fraxini or mutila, I'm still not sure how to distinguish them without dark brown conidia abundantly present) released a pigment into water or KOH mount, hyaline in visible light, but bluegreen in UV 365 nm. (The dark blue background is an artifact, I probably forgot to use UV filter.)
Correction: the UV+ water-soluble pigment it's actually not from the fungus, but from upper layer of Fraxinus bark. :-/ Sorry for not checking that before.
By the way, my collections identified as Diplodia (fraxini or mutila, I'm still not sure how to distinguish them without dark brown conidia abundantly present) released a pigment into water or KOH mount, hyaline in visible light, but bluegreen in UV 365 nm. (The dark blue background is an artifact, I probably forgot to use UV filter.)
Correction: the UV+ water-soluble pigment it's actually not from the fungus, but from upper layer of Fraxinus bark. :-/ Sorry for not checking that before.
